Zsolt Fabok
September 21, 2012
280

# [LASCOT2012] Measure and Manage Flow

The fifth iteration of this talk, presented at Lean Agile Scotland 2012.

Please note that the content of this talk changes after each event, because I'm continuously improving it using the feedback and the needs of the audience.

## Zsolt Fabok

September 21, 2012

## Transcript

1. ### Measure and Manage Flow in Practice @ZsoltFabok http://zsoltfabok.com/ #lascot12 http://www.leanagilescotland.com/

by Zsolt Fabok 2012.09.21

3. ### WIP point of observation Visualize the situation with Cumulative Flow

Diagram solved
4. ### The Cumulative Flow Diagram Done Started Queued lead time cycle

time WIP backlog time number of work items It offers more than just the WIP...
5. ### ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Q D 3 4 1 2 The simplest way of collecting data:

detour:

10. ### Let’s add more people to the project so that “things

speed up”! /* detour */

detour */
12. ### Actually, “things slow down”, so it was not a good

idea (solve the right problem instead - systems thinking). End of the detour.

15. ### Distribution of lead times days count 0 3 5 8

10 13 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 22 28 33 56 average median* *Calculation of medians is a popular technique in summary statistics and summarizing statistical data, since it is simple to understand and easy to calculate, while also giving a measure that is more robust in the presence of outlier values
16. ### time spent on implementation (hours) time spent waiting (hours) %

1 63 98 7 57 90 2 62 97 2 62 97 3 61 96 Some examples of work items with 8-day lead time

18. ### Distribution of lead times days count 0 3 5 8

10 13 15 1 4 7 10 13 16 33 Before average 0 3 5 8 10 13 15 1 3 5 7 9 11 13 22 count days After median

21. ### 0 4 8 11 15 31-32 33-34 35-36 37-38 Number

of rejected work items count week
22. ### 0 4 8 11 15 31-32 33-34 35-36 37-38 39-40

42-43 44-45 Number of rejected work items count week

24. ### Sales: “I want to know when the new features can

hit the market!” Management: “I want to know how much it will cost me!”
25. ### All the work items we had so far (~20 work

items) ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ v v v v v v v v
26. ### Categorizing them into three groups ~ ~ ~ ~ ~

~ ~ ~ ~ ~ ~ ~ v v v v v v v v S M L
27. ### The lead time distribution ~ ~ ~ ~ ~ ~

~ ~ v v v v M 0 1 1 2 3 3 4 1 2 3 4 5 6 7 8 9 12 13 16 SLA days count Expired
28. ### The spent time distribution ~ ~ ~ ~ ~ ~

~ ~ v v v v M 0 1 2 3 4 5 6 6 7 8 9 10 SLA hours count

30. ### #1 We decided that we would force ourselves to keep

the SLA #2 Nothing changed. Still the same ratio

32. ### “If you start measuring something you start optimizing it, and

I know it's the wrong thing to optimize.” A quote which is worth considering http://paulgraham.com/swan.html
33. ### The key ideas 1. We develop software not models (value)

2. Demand ﬁrst, supply second 3. Observe the system (lead time, throughput) 4. Start measuring, look back if necessary 5. Manage 6. Mind that data expires 7. Goto step 3.